package dk.eclipse.android.helpers;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuffXfermode;
import android.graphics.Bitmap.Config;
import android.graphics.PorterDuff.Mode;
import android.graphics.Shader.TileMode;
import android.util.Log;

/**
 * This helper class handles common bitmap operations.
 * 
 * @author Ronni
 * 
 */
public class BitmapHelper {

	/**
	 * Loads a bitmap via a file path.
	 * 
	 * @param path
	 * @return the loaded bitmap
	 */
	public static Bitmap loadFile(String path) {
		return BitmapFactory.decodeFile(path);
	}

	/**
	 * Loads a bitmap via a url. You might use Async- or UserTask when loading
	 * our images, to avoid UI stickiness.
	 * 
	 * @param url
	 * @return the loaded bitmap
	 */
	public static Bitmap loadImage(URL url) throws IOException {

		URLConnection conn = null;
		BufferedInputStream bis = null;
		Bitmap bm = null;
		
		conn = url.openConnection();
		conn.connect();
		bis = new BufferedInputStream(conn
				.getInputStream());
		bm = BitmapFactory.decodeStream(bis);
		bis.close();
		
		return bm;
	}

	/**
	 * Creates a new bitmap with reflection.
	 * 
	 * @param context
	 * @param originalImage
	 * @return the new bitmap with reflection
	 */
	public static Bitmap createReflectedImage(Context context,
			Bitmap originalImage) {
		// The gap we want between the reflection and the original image
		final int reflectionGap = 4;

		int width = originalImage.getWidth();
		int height = originalImage.getHeight();

		// This will not scale but will flip on the Y axis
		Matrix matrix = new Matrix();
		matrix.preScale(1, -1);

		// Create a Bitmap with the flip matrix applied to it.
		// We only want the bottom half of the image
		Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,
				height / 2, width, height / 2, matrix, false);

		// Create a new bitmap with same width but taller to fit reflection
		Bitmap bitmapWithReflection = Bitmap.createBitmap(width,
				(height + height / 2), Config.ARGB_8888);

		// Create a new Canvas with the bitmap that's big enough for
		// the image plus gap plus reflection
		Canvas canvas = new Canvas(bitmapWithReflection);
		// Draw in the original image
		canvas.drawBitmap(originalImage, 0, 0, null);
		// Draw in the gap
		Paint defaultPaint = new Paint();
		canvas.drawRect(0, height, width, height + reflectionGap, defaultPaint);
		// Draw in the reflection
		canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);

		// Create a shader that is a linear gradient that covers the reflection
		Paint paint = new Paint();
		LinearGradient shader = new LinearGradient(0,
				originalImage.getHeight(), 0, bitmapWithReflection.getHeight()
						+ reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);
		// Set the paint to use this shader (linear gradient)
		paint.setShader(shader);
		// Set the Transfer mode to be porter duff and destination in
		paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
		// Draw a rectangle using the paint with our linear gradient
		canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()
				+ reflectionGap, paint);

		return bitmapWithReflection;
	}

	/**
	 * Resizes a bitmap.
	 * 
	 * @param bm
	 * @param newHeight
	 * @param newWidth
	 * @return the resized bitmap
	 */
	public static Bitmap getResizedBitmap(Bitmap bm, int newHeight, int newWidth) {

		int width = bm.getWidth();

		int height = bm.getHeight();

		float scaleWidth = ((float) newWidth) / width;

		float scaleHeight = ((float) newHeight) / height;

		// create a matrix for the manipulation

		Matrix matrix = new Matrix();

		// resize the bit map

		matrix.postScale(scaleWidth, scaleHeight);

		// recreate the new Bitmap

		Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height,
				matrix, false);

		return resizedBitmap;

	}

}
